/Engine/Plugins/Runtime/nDisplay/Source/DisplayCluster/Public/Render/Device/IDisplayClusterRenderDevice.h
Finish rendering the frame and compose the viewports for the final RTT (Warp&Blend, OCIO, ICVFX, etc.) Release references to DCRA objects. Must be called after all viewports have been rendered. [ This pair of functions InitializeNewFrame should always be called together. ]
void FinalizeNewFrame()